Behind the onslaught is a well-funded network of conservative think tanks that you've probably never heard of. Conceived by the same conservative ideologues who helped found the Heritage Foundation, the State Policy Network (SPN) is a little-known umbrella group with deep ties to the national conservative movement. Its mission is simple: to back a constellation of state-level think tanks loosely modeled after Heritage that promote free-market principles and rail against unions, regulation, and tax increases. By blasting out policy recommendations and shaping lawmakers' positions through briefings and private meetings, these think tanks cultivate cozy relationships with GOP politicians. And there's a long tradition of revolving door relationships between SPN staffers and state governments. While they bill themselves as independent think tanks, SPN's members frequently gather to swap ideas. "We're all comrades in arms," the network's board chairman told the National Review in 2007.

Occasionally, SPN think tanks boast of their clout. Such was the case when the Tennessee Center for Policy Research bragged on its website recently that it "leads the charge against teachers' union" and "laid the groundwork" for the bills now in the Tennessee legislature to restrict, and possibly eradicate, bargaining for public school teachers. More often, though, the fingerprints of SPN's members are less apparent.

Founded in 1992 by businessman and Reagan administration insider Thomas Roe—who also served on the Heritage Foundation's board of trustees for two decades—the group has grown to include 59 "freedom centers," or affiliated think tanks, in all 50 states. SPN's board includes officials from Heritage and right-wing charities such as the Adolph Coors and Jacqueline Hume foundations. Likewise, its deep-pocketed donors include all the usual heavy-hitting conservative benefactors: the Ruth and Lovett Peters Foundation, which funds the Cato Institute and Heritage; the Castle Rock Foundation, a charity started with money from the conservative Coors Foundation; and the Bradley Foundation, a $540 million charity devoted to funding conservative causes. SPN uses their contributions to dole out annual grants to member groups, ranging from a few thousand dollars to $260,000, according to 2009 records.

According to SPN's website, Roe launched the conservative network "at the urging" of President Reagan himself as a way to shape state-level policy just as Heritage has influenced federal policy. Surveying the political landscape today, Roe's and Reagan's idea couldn't have been more prescient. More than a dozen states are currently considering legislation weakening the clout of organized labor. In many of those states, SPN think tanks have been pushing for similar prescriptions for years via "research" papers, policy recommendations, and talking points that are widely distributed to lawmakers.

In Iowa, Republican Gov. Terry Branstad cited research (flawed, it turned out) by SPN's Public Interest Institute in his January 2011 budget address to justify curbing the state's collective bargaining law for public workers. (Last month, the GOP-controlled Iowa House passed a bill limiting bargaining rights, but the measure died in the Democratic-controlled Senate.)

In Michigan, as Mother Jones previously reported, the Mackinac Center for Public Policy, an SPN member, published a list of four policy recommendations that would give unelected "emergency managers" more power to go into municipalities and wipe out union contracts and fire local elected officials, all in the name of repairing broken budgets. All four ended up in Governor Rick Snyder's "financial martial law," as one GOP lawmaker described it. The bill was signed into law in March.

The Nevada Policy Research Institute (NPRI) has for more than a decade bashed the Silver State's efforts to pass collective bargaining laws and accused unions of trying to "monopolize the public sector." In March, Nevada Republicans, citing NPRI data, introduced a bill of their own to weaken bargaining rights. There, as in other states considering similar measures, GOP lawmakers called on an SPN staffer to testify on the bill, which he did favorably.

In California, where a Republican lawmaker introduced a bill in February to repeal collective bargaining on retirement benefits for public workers, the Pacific Research Institute (PRI) has churned out a steady stream of reports and op-eds claiming that teachers unions use collective bargaining to "neuter school board authority, protect bad teachers, restrict principals, emphasize seniority over performance, and limit teacher evaluation and accountability." That is, bargaining is to blame for just about everything that's gone wrong. A 2003 PRI paper recommended that policymakers "streamline or repeal" collective bargaining for teachers.